This is so stupid I love it

The geothermal gradient is different at different parts of the earth. You can probably bake a pizza at much shallower depths at the mid ocean ridge, near a volcano, or even at an active orogeny.

Did you try any of these and not like it? Yes -> geology

That’s a fair point. It still is a misleading plot since it isn’t an estimate cod population, and isn’t representative of population after 1992. As you said the numbers are still bleak. I found this plot , Source , which does tell a similar story around the early 90s but indicates greater recovery in more recent years.

This is kind of misleading since they closed the fishery (I think in the 90s), so the amount of cod catch would naturally plummet. The fishery did, however, need to be closed due to overfishing.